Add kubermatic-playground-setup example

[mgoltzsche]

What this PR does / why we need it:

Adds the kubermatic-playground-setup example: An example KubeOne & KKP AWS setup for testing purposes that mostly consists of a Makefile, loading the Kubermatic-internal AWS playground credentials from Vault.
So far everything but the MLA stack installation works.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[Copilot]

Pull request overview

Adds a new examples/kubermatic-playground-setup example that provisions an AWS-based KubeOne cluster, installs KKP, and automates supporting steps (Vault-sourced credentials, Route53 DNS management, and initial KKP/MLA config scaffolding) for internal playground/testing use.

Changes:

• Add a Makefile-driven workflow to provision infrastructure (Terraform), create the cluster (KubeOne), install KKP, and manage Route53 DNS.
• Add Vault login helper scripts to fetch AWS/Route53 credentials and run commands with the resulting environment.
• Vendor/copy KubeOne AWS Terraform quickstart configs plus KKP seed/preset manifests and MLA example values.

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
examples/kubermatic-playground-setup/README.md	Top-level usage guide for creating/upgrading/destroying the playground environment.
examples/kubermatic-playground-setup/Makefile	Primary automation entrypoint for Terraform, KubeOne, KKP install, DNS, and MLA-related steps.
examples/kubermatic-playground-setup/.gitignore	Ignores generated state/artifacts (tfstate, kubeconfigs, downloaded releases, generated secrets/values).
examples/kubermatic-playground-setup/scripts/with-aws-login.sh	Fetch AWS credentials from Vault and execute a child command with exported env vars.
examples/kubermatic-playground-setup/scripts/route53-login.sh	Fetch Route53-specific AWS credentials from Vault (intended to be sourced).
examples/kubermatic-playground-setup/scripts/route53-list-records.sh	List Route53 zones/records (A/CNAME) using Vault-sourced credentials.
examples/kubermatic-playground-setup/scripts/route53-modify-record.sh	UPSERT/DELETE Route53 A/CNAME records using Vault-sourced credentials.
examples/kubermatic-playground-setup/00-terraform/README.md	Notes that Terraform configs are copied from the KubeOne examples.
examples/kubermatic-playground-setup/00-terraform/aws/main.tf	AWS Terraform resources for VPC subnets, security groups, instances, ELB, IAM, etc.
examples/kubermatic-playground-setup/00-terraform/aws/variables.tf	Terraform input variables (mostly from upstream KubeOne example).
examples/kubermatic-playground-setup/00-terraform/aws/output.tf	Terraform outputs consumed by KubeOne/Makefile (hosts/workers/api endpoint).
examples/kubermatic-playground-setup/00-terraform/aws/versions.tf	Terraform + provider version constraints for the AWS quickstart configs.
examples/kubermatic-playground-setup/00-terraform/aws/userdata_flatcar_upgrades.json	Ignition snippet used to disable Flatcar update server when configured.
examples/kubermatic-playground-setup/00-terraform/aws/README.md.in	Template input for generated Terraform docs.
examples/kubermatic-playground-setup/00-terraform/aws/README.md	Generated Terraform docs for the vendored AWS quickstart config.
examples/kubermatic-playground-setup/10-kubeone/kubeone-cluster.yaml	Minimal KubeOne cluster definition for AWS.
examples/kubermatic-playground-setup/20-kkp/README.md	Notes about KKP installation file structure and upstream install docs link.
examples/kubermatic-playground-setup/20-kkp/seed.yaml	Seed CR used to register the seed and enable usercluster MLA.
examples/kubermatic-playground-setup/20-kkp/preset.example.yaml	Preset template to be patched with AWS credentials + VPC ID.
examples/kubermatic-playground-setup/20-kkp/kubermatic-backup-storageclass.yaml	StorageClass used for backups/MLA persistence in the example.
examples/kubermatic-playground-setup/20-kkp/mla-seed-values.example.yaml	Example seed-MLA values template consumed by Makefile generation.
examples/kubermatic-playground-setup/20-kkp/mla-usercluster-values.example.yaml	Example usercluster-MLA values template (intended for generation/use).

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